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Description of Business, Basis of Presentation and Significant Accounting Policies and Recently Issued Accounting Pronouncements - Description of Business (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) branch tranch segment	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Business Description and Basis of Presentation [Line Items]
Allowance for credit losses on loans	$ 70,185	$ 37,993	$ 36,171
Variable Interest Entity Number of Investments | tranch	2
Number of Tranches | tranch	3
Tax Credit Carryforward, Required Funding Percentage	85.00%
Number of operating segments | segment	1
Unused Commitments to Extend Credit [Member]
Business Description and Basis of Presentation [Line Items]
Allowance for credit losses on loans	$ 4,681		$ 306	$ 306	$ 170
Heritage Bank
Business Description and Basis of Presentation [Line Items]
Number of branches operating | branch	53
Investment Tax Credit Carryforward [Member] | Subsidiaries [Member]
Business Description and Basis of Presentation [Line Items]
Qualified Equity Investments	$ 25,000

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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